Heavy quarks play an important role in probing the properties of strongly interacting quark-gluon plasma (QGP) created in ultra-relativistic heavy ion collisions. We have studied the interactions of single heavy (charm) quarks and correlated charm and anti-charm (
In this paper a pair of observables are proposed as alternative ways, by examining the fluctuation of net momentum-ordering of charged pairs, to study the charge separation induced by the Chiral Magnetic Effect (CME) in relativistic heavy ion collisions. They are, the out-of-plane to in-plane ratio of fluctuation of the difference between signed balance functions measured in pair’s rest frame, and the ratio of it to similar measurement made in the laboratory frame. Both observables have been studied with simulations including flow-related backgrounds, and for the first time, backgrounds that are related to resonance's global spin alignment. The two observables have similar positive responses to signal, and opposite, limited responses to identifiable backgrounds arising from resonance flow and spin alignment. Both observables have also been tested with two realistic models, namely, a multi-phase transport (AMPT) model and the anomalous-viscous fluid dynamics (AVFD) model. These two observables, when cross examined, will provide useful insights in the study of CME-induced charge separation.
By adopting test scalar field perturbation, we study the quasinormal modes (QNMs) of charged black holes in the Einstein-Maxwell-Weyl (EMW) gravity. We find that the imaginary part of QNM frequencies is always negative for different angular parameter l, thus impling that these modes always decay and are therefore stable. In addition, we don’t observe any good linear relation between ω and p for these charged black holes, because the charge Q brings about nonlinear effect. We have also evaluated the massive scalar field perturbation against the charged black holes, and found that the random long lived modes (so-called quasiresonances) would be able to exist in this spectrum.
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